chore(*): release 3.21.0c (#479)

README.md

@@ -16,7 +16,7 @@
 About
 -----
 
-- **Important**: This is Lean 3.20.0c, a fork of Lean 3 maintained and updated by the Lean community. The last official release of Lean 3.x was Lean 3.4.2, which can be found [here](https://github.com/leanprover/lean). The Lean developers are currently developing [Lean 4](https://github.com/leanprover/lean4).
+- **Important**: This is Lean 3.21.0c, a fork of Lean 3 maintained and updated by the Lean community. The last official release of Lean 3.x was Lean 3.4.2, which can be found [here](https://github.com/leanprover/lean). The Lean developers are currently developing [Lean 4](https://github.com/leanprover/lean4).
 - [Lean Homepage](http://leanprover.github.io)
 - [Lean Prover Community Homepage](https://leanprover-community.github.io)
 - [Theorem Proving in Lean](https://leanprover.github.io/theorem_proving_in_lean/index.html)

doc/changes.md

@@ -1,3 +1,17 @@
+3.21.0c (12 October 2020)
+-------------------------
+
+Features:
+- Simplify definition of `band` and `bor` (#466)
+- More advice in docstrings for `Exists`, `not`, `and`, and `or` (#296)
+
+Bug fixes:
+- Fix typo in docstring for `tactic.exact` (#472)
+- Fix missing code block in [widget server docs](widget_server.md) (#473)
+
+Changes:
+- Remove global notation for `vector.cons` (#471)
+
 3.20.0c (9 September 2020)
 --------------------------
 

src/CMakeLists.txt

@@ -4,7 +4,7 @@ if ((${CMAKE_MAJOR_VERSION}.${CMAKE_MINOR_VERSION} GREATER 3.1) OR (${CMAKE_MAJO
 endif()
 project(LEAN CXX C)
 set(LEAN_VERSION_MAJOR 3)
-set(LEAN_VERSION_MINOR 20)
+set(LEAN_VERSION_MINOR 21)
 set(LEAN_VERSION_PATCH 0)
 set(LEAN_VERSION_IS_RELEASE 1)  # This number is 1 in the release revision, and 0 otherwise.
 set(LEAN_SPECIAL_VERSION_DESC "" CACHE STRING "Additional version description like 'nightly-2018-03-11'")